Section 5. Military courtesy.
In all walks of life men who are gentlemanly and of good breeding are always respectful and courteous to those about them. It helps to make life move along more smoothly. In civil life this courtesy is shown by the custom of tipping the hat to ladies, shaking hands with friends. and greeting persons with a nod or a friendly "Good morning," etc.
In the Army courtesy is just us necessary, and for the same reasons. It helps to keep the great machine moving without friction.
"Courtesy among military men is indispensable to discipline; respect to superiors will not be confined to obedience on duty, but will be extended on all occasions." (Par. 4, Army Regulations, 1913.)
One method of extending this courtesy is by saluting. When in ranks the question of what a private should do is simple--he obeys any command that is given. It is when out of ranks that a private must know how and when to salute.